#--------------1------------
from  tkinter import *
import random
import time

tk = Tk()
tk.title("Game")
tk.resizable(0,0)
tk.wm_attributes("-topmost",1)
canvas = Canvas(tk, width=500, height=400, bd=0,highlightthickness=0)
canvas.pack()
tk.update()


#tk.mainloop()
#---------------2--------------

class Ball:
    def __init__(self, canvas,paddle,color):
        self.paddle = paddle
        self.canvas = canvas
        self.hit_bottom = False
        self.id = canvas.create_oval(10,10,25,25,fill=color)
        self.canvas.move(self.id, 245, 100)
        ###3###
        starts = [-3,-2,-1,1,2,3]
        random.shuffle(starts)
        self.x = starts[0]
        self.y = -3
        ###3###
        ##初始化速度###
        #self.x=0
        #self.y=-1
        self.canvas_height = self.canvas.winfo_height()
        #####
        self.canvas_width = self.canvas.winfo_width()
        
    def draw(self):
        #pass
        ##self.canvas.move(self.id,0,-1)
        self.canvas.move(self.id, self.x,self.y)
        pos = self.canvas.coords(self.id)
        ##图形的坐标有四个值，上下左右
        if(pos[1]<=0):
            self.y=3
        if(pos[3]>=self.canvas_height):
            self.y = -3
            self.hit_bottom = True
        #---接到球-------
        if(self.hit_paddle(pos) == True):
            self.y = -3
        #-------
        if(pos[0]<=0):
            self.x =3
        if(pos[2]>=self.canvas_width):
            self.x=-3

    def hit_paddle(self,pos):
        paddle_pos = self.canvas.coords(self.paddle.id)
        if(pos[2]>= paddle_pos[0] and pos[0]<= paddle_pos[2]):
            if(pos[3] >=paddle_pos[1] and pos[3]<= paddle_pos[3]):
                return True
        return False

            
class Paddle:
    def __init__(self, canvas, color):
        self.canvas = canvas
        self.id = canvas.create_rectangle(0,0,100,10, fill=color)
        self.canvas.move(self.id, 200,300)
        #####
        self.x =0
        self.canvas_width = self.canvas.winfo_width()
        self.canvas.bind_all('<KeyPress-Left>',self.turn_left)
        self.canvas.bind_all('<KeyPress-Right>',self.turn_right)

    def turn_left(self,evt):
        self.x = -2
    def turn_right(self, evt):
        self.x = 2
    def draw(self):
        self.canvas.move(self.id, self.x, 0)
        pos = self.canvas.coords(self.id)
        if pos[0]<0:
            self.x = 0
        elif pos[2] >=self.canvas_width:
            self.x =0

paddle = Paddle(canvas,'blue')
ball = Ball(canvas, paddle,'red')
#ball2 = Ball(canvas, 'green')
#ball3 = Ball(canvas, 'yellow')
while 1:
   # ball3.draw()
   # ball2.draw()
    ball.draw()
    paddle.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)
    
#------------------3----------------------





    
